Abstract

Abstract

Overview

This research focuses on passive techniques for magnetic field mitigation specifically in the 69/115 kV underground power system which is managed by the Metropolitan Electricity Authority (MEA). The primary methods examined include conductive loop, conductive shield, and ferromagnetic shield.

Methodology

• Use of Finite Element Method Magnetics (FEMM) for simulation.
• Examination of magnetic fields with and without the mitigation system.

Findings

The results indicate that all proposed passive techniques effectively reduce magnetic field values below the thresholds set by the International Commission on Non-Ionizing Radiation Protection (ICNIRP) and European standards.

Conclusion

The study demonstrates the effectiveness of various passive shielding techniques in reducing the exposure levels of low-frequency magnetic fields below the 10 μT safety limit. While conductive and ferromagnetic shields show higher effectiveness, the material of the ferromagnetic shield suggests a higher risk of failure due to material fragility.